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Biomolecules Test - 40

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Biomolecules Test - 40
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Which of the following statements is/are incorrect?

    I. Amylose does not give blue colour with $$I_2$$ solution.

    II. Amylopectin gives blue colour with $$I_2$$ solution.

    III. Amylum is present in wheat, maize, rice, potatoes, barley, sorghum etc.

    IV. Amylose is linear polymer of D-glucose units.
    Solution
    Option (A) is correct.
    I. Amylose gives blue colour with $$I_2$$ solution. Amylose is a linear chain polymer that forms crystalline structures in the starch. When reacted with iodine, the iodine molecules enter the cavities of the crystalline structures and reflect the characteristic blue colour. When the starch solution is heated, these crystalline structures are disrupted forming a random chain, and hence, the loss of colour. Upon cooling, amylose has the ability, to refold into its crystalline form and hence the colour is regained to blue upon cooling.
    II. Amylopectin does not give blue colour with $$I_2$$ solution.
  • Question 2
    1 / -0
    Which one of the following is the cofactor of carbonic anhydrase?
    Solution
    • Iron (Fe) is an important component of hemoglobin, the substance in red blood cells that carries oxygen from your lungs to transport it throughout your body. 
    • Zinc (Zn) is a cofactor for alcohol dehydrogenase and carbonic anhydrase.
    • Copper (Cu) is a cofactor for one form of nitrite reductases.
    • Magnesium (Mg) is a cofactor for enzyme glucose 6-phosphatase involved in the process of glycolysis.

    So, the correct answer is option B.
  • Question 3
    1 / -0
    Which of the following is not a part of enzyme but it activates the enzyme?
    Solution
    Enzymes requires metal ion as a cofactor  which activates their catalytic activity. For example carbonic anhydrase and alcohol dehydrogenase require zinc, arginase and ribonucleotide reductase require manganese, dinitrogenase and nitrate reductase require molybdenum, pyruvate kinase requires potassium. The metal ions Mo, Zn and Mn are present at the active site of enzymes and the respective enzymes are called metalloproteins but potassium requiring enzymes are not metalloproteins as it is not a part of enzyme but it activates the enzyme.
  • Question 4
    1 / -0
    Which of the following is called "biological middle man"?
    Solution
    Enzymes are proteinaceous in nature. These are the biocatalyst that speeds up the chemical reaction by lowering the activation energy of a reaction without undergoing any change in itself because of this peculiar nature they are known as "Middle Man".
  • Question 5
    1 / -0
    Enzymes are absent in
    Solution
    Enzymes are biological catalysts. Without enzymes no biochemical reaction can take place in any living cell at biologically significant rate. Virus are non living, crystallizable entities. Hence, virus do not have any enzymes of their own but make use of enzyme machinery of the host for their replication.
  • Question 6
    1 / -0
    Which of the following statement is correct about the enzymes?
    Solution
    • All enzymes have different optimum pH values. For example, protein-digesting enzymes are highly active at very low pH whereas salivary amylase is most active at alkaline pH. 
    • Biochemically enzymes are polymers of amino acids. They are not amino acids but are polymers of amino acids. 
    • Enzymes are active in a narrow biological range of temperature and pH. Thus, enzymes become inactive at very low or very high temperatures. 
    • Most of the enzymes barring a few exceptions are proteins. Few non-proteinaceous enzymes are catalytic RNAs i.e. ribozymes.

    So, the correct answer is 'They are all proteins except ribozymes.'
  • Question 7
    1 / -0
    Diastase enzyme converts _________ to _________.
    Solution
    The conversion of starch to maltose is catalyzed by the enzyme diastase.

    $$starch \xrightarrow {diastase} maltose$$

    Option B is correct.

  • Question 8
    1 / -0
    Modern detergents contain enzyme preparations of
    Solution
    Enzyme detergents have basic or alkaline pH with values ranging between 8 and 10.5. Hence, the enzymes in detergents should be active at alkaline pH or be an alkaliphile. At present only proteases and amylases are commonly used. Although a wide range of lipases is known, but lipases suitable for use in detergent preparations have been described recently.
  • Question 9
    1 / -0
    Enzymes as they exist inside the cell are
    Solution
    Enzymes are biological catalysts that catalyze metabolic reactions inside living cells. Mostly enzymes are made up of proteins and have a high molecular weight example 6000 for bacterial ferredoxin, 250,000 for catalase, 483,000 for urease and 4600,000 for pyruvate dehydrogenase. Therefore, enzymes occurs in colloidal state (particle size 1-200 nm) inside living cells.
  • Question 10
    1 / -0
    Which one of the following is wrongly matched?
    Solution
    Enzymes are not lipopolysaccharide in nature. Most of the enzymes are catalytic proteins. Some enzymes, which catalyze splicing of introns and replication of telomeres in eukaryotic cell, are catalytic RNA molecules. 
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